0625 PHYSICS. Mark schemes must be read in conjunction with the question papers and the Report on the Examination.

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1 UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the June 005 question paper 065 PHYSICS 065/0 Paper (Extended), maximum mark 80 This mark scheme is published as an aid to teachers and students, to indicate the requirements of the examination. It shows the basis on which Examiners were initially instructed to award marks. It does not indicate the details of the discussions that took place at an Examiners meeting before marking began. Any substantial changes to the mark scheme that arose from these discussions will be recorded in the published Report on the Examination. All Examiners are instructed that alternative correct answers and unexpected approaches in candidates scripts must be given marks that fairly reflect the relevant knowledge and skills demonstrated. Mark schemes must be read in conjunction with the question papers and the Report on the Examination. CIE will not enter into discussion or correspondence in connection with these mark schemes. CIE is publishing the mark schemes for the June 005 question papers for most IGCSE and GCE Advanced Level and Advanced Subsidiary Level syllabuses and some Ordinary Level syllabuses.

2 Grade thresholds for Syllabus 065 (Physics) in the June 005 examination. maximum mark available minimum mark required for grade: A C E F Component The threshold (minimum mark) for B is set halfway between those for Grades A and C. The threshold (minimum mark) for D is set halfway between those for Grades C and E. The threshold (minimum mark) for G is set as many marks below the F threshold as the E threshold is above it. Grade A* does not exist at the level of an individual component.

3 June 005 IGCSE MARK SCHEME MAXIMUM MARK: 80 SYLLABUS/COMPONENT: 065/0 PHYSICS Extended

4 Page Mark Scheme Syllabus Paper (a) acceleration, speed increases acceleration getting less acc. zero/constant speed along RT or terminal velocity air resistance or friction (force) up (accept upthrust) weight/(force of) gravity down air resistance (up) = weight (down) or two forces equal no (net) force, no acceleration (d) (i) distance = speed x time or 0 x 40 distance = 4800 m distance = average speed x time or 5 x 6 or area under graph distance = 50 m 4 [] (a) time a number of swings (if number stated, >5) time divided by [ x number of swings] M (i) weight of gravity and tension force towards centre of circular motion or towards support point p.e. = mgh or 0. x 0 x 0.05 = 0. J [6] (a) in a straight line or (vector) has direction f = ma or f =.0 x.0 = 6(.0) N P = F/a or P = 0/0.05 = 400 N/m (or Pa) [5] 4 (a) start temp. and final temp. or change in temperature mass of iron time heater on P x t, VIt or in words = m x shc x cit or words (i) heat lost to surroundings/air add lagging/insulate [7] University of Cambridge International Examinations 005

5 Page Mark Scheme Syllabus Paper 5 (a) air molecules hit particles or vice versa air molecules have speed/moment/energy hits uneven or from all directions hits (by small molecules) can move a large particle or moves particles small distances 4 (i) most energetic/fastest molecules need energy to overcome forces/break bonds/separate mols. so work must be done/energy used as work [7] 6 (a) along normal or angle i = 0 so angle r = 0 speed reduced, wavelength reduced, frequency unchanged any two correct scores one mark third correct scores second mark reflected at 0 o refracted at > 0 o (d) sin 0 o /sin r = 0.67 sin r = sin 0 o /0.67 r = 48 o [8] 7 (a) (i) x-rays or gamma rays infra red or radio f = v/ λ or x 0 8 / x 0 - = x 0 0 Hz x 0 8 m/s [5] 8 (a) circuit which would work with supply and resistor voltmeter in parallel and ammeter in series with resistor variable resistor in series or means of changing p.d. across resistor read ammeter and voltmeter adjust rheostat/supply (i) (iii) I = V/R or V = IR or R = V/I or 0.5 = 6.0/.0 + R R = 9(.0) Ω 60 C P = VI or = I R or P = v /R or (0.5 x.0) x 0.5 = 0.75 W 5 [0] University of Cambridge International Examinations 005

6 Page Mark Scheme Syllabus Paper 9 (a) (i) to change a.c. to d.c. or rectify (a.c.) full sine wave at least.5 full waves half wave rectified at least two d.c. bumps (i) correct symbol when input high or, output low or 0 or off when input low or 0 or off, output high or or on [6] 0 (a) 8 (mins) for value, no working shown 8 (mins) for value with suitable working or indication on graph (i) source, aluminium and detector, recognisable shapes quality and all labels correct count background source and detector, no absorber, count taken source, absorber and detector, count taken [7] (a) magnetic field and current at right angles causes force on wire which deflects it or field around wire () interacts with the field of the magnet () normal to/between poles, either way however expressed out of paper converts electrical energy to work/k.e./movement energy (d) (i) split rings and brushes or equivalent (e.g. leaning wires) every half turn current passes from one ring to the other so current flows opposite way around coil or commutates [8] University of Cambridge International Examinations 005

7 Page 4 Mark Scheme Syllabus Paper NOTES ABOUT THE MARK SCHEME SYMBOLS B marks M marks C marks A marks c.a.o. e.c.f. e.e.o.o brackets () underlining un.pen. OR/or are independent marks, which do not depend on any other marks. For a B mark to be scored, the point to which it refers must actually be seen in the candidate s answer. are method marks upon which accuracy marks (A marks) later depend. For an M mark to be scored, the point to which it refers must be seen in a candidate s answer. If a candidate fails to score a particular M mark, then none of the dependent A marks can be scored. are compensatory method marks which can be scored even if the points to which they refer are not written down by the candidate, provided subsequent working gives evidence that they must have known it. e.g. if an equation carries a C mark and the candidate does not write down the actual equation but does correct working which shows he knew the equation, then the C mark is scored. are accuracy or answer marks which either depend on an M mark, or allow a C mark to be scored. means correct answer only means error carried forward. This indicates that if a candidate has made an earlier mistake and has carried his incorrect value forward to subsequent stages of working, he may be given marks indicated by e.c.f. provided his subsequent working is correct, bearing in mind his earlier mistake. This prevents a candidate being penalised more than once for a particular mistake, but only applies to marks annotated e.c.f. means each error or omission Around words or units in the mark scheme are intended to indicate wording used to clarify the mark scheme, but the marks do not depend on seeing the words or units in brackets. e.g. 0 (J) means that the mark is scored for 0, regardless of the unit given. Indicates that this must be seen in the answer offered, or something very similar. means unit penalty. An otherwise correct answer will have one mark deducted if the unit is wrong or missing. This only applies where specifically stated in the mark scheme. Elsewhere, incorrect or missing units are condoned. Indicates alternative answers, any one of which is satisfactory for scoring the marks. University of Cambridge International Examinations 005

MARK SCHEME for the May/June 2010 question paper for the guidance of teachers 0625 PHYSICS. 0625/22 Paper 22 (Core Theory), maximum raw mark 80

UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education MARK SCHEME for the May/June 2010 question paper for the guidance of teachers 0625 PHYSICS 0625/22